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11 The Cell Cycle
Replication of DNA
2 main stages:

1. Nuclear division- meiosis- mitosis
2. Cell division- follows nuclear division

BEFORE nucleus divides, DNA must be replicated.

Semi-conservative replication model

For this to take place, there are 4 conditions:

1. The 4 types of nucleotide must be present with…

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MITOSIS- produces 2 diploid daughter nuclei

MEIOSIS- produces 4 haploid daughter nuclei

Important for:




The Cell Cycle
Has 3 stages:

1. INTERPHASE, longest phase (90% of total time), has 3 parts
a) G phase (first growth phase), proteins which synthesise cell organelles are produced
b) S,…

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2. NUCLEAR DIVISION, when the nucleus divides into two (mitosis) or four (meiosis)
3. CELL DIVISION, process by which the whole cell divides into two (mitosis) or four (meiosis)


As a result of damage to the genes that regulate mitosis leading to uncontrolled division of cells. A
large group…


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